---
title: 'Senior React Native Engineer at Mattermost'
canonical: 'https://feeny.ai/job/senior-react-native-engineer-mattermost-united-states-jmwaqw3c3jaa'
type: 'job'
last_seen: '2026-09-05'
---

# Senior React Native Engineer at Mattermost

- **Company:** Mattermost
- **Location:** United States
- **Posted:** 2026-06-01
- **Last confirmed live:** 2026-09-05
- **Apply:** https://job-boards.greenhouse.io/mattermost/jobs/5238290008

## Job description

Mattermost is the leading collaborative workflow platform for defense, intelligence, security, and critical infrastructure. Trusted by the U.S. Department of War and Fortune 500s, our platform runs on-premises and in private clouds, delivering secure messaging, file sharing, workflow automation, audio/screenshare, and project management—all with full data and operational control. Mattermost powers high-stakes workflows across mission planning, real-time, real-world operations, DevSecOps, incident response, and cyber defense—enabling secure collaboration from tactical edge and DDIL environments to enterprise HQ. Teams operate across web, desktop, and mobile, with embedded interoperability for Microsoft Teams, Outlook, and Microsoft 365.

To learn more, visit [www.mattermost.com](http://www.mattermost.com/)

We are seeking a Senior React Native Engineer to take ownership of the Mattermost mobile experience for teams working in defense, intelligence, and critical infrastructure. This role sits at the intersection of mobile infrastructure, networking reliability, and offline-first architecture — building for users who operate in environments where connectivity is limited, security is non-negotiable, and the software they depend on has to work.

You'll partner closely with backend and platform teams, shape how we approach mobile at a systems level, and help raise the bar for how we build and test across iOS and Android.

## Responsibilities

- Architect and evolve the React Native application for deployment environments with limited or unreliable connectivity
- Define how the app handles WebSocket reliability and data synchronization across degraded network conditions
- Design offline-first storage and sync patterns, including conflict resolution strategies
- Shape mobile development tooling, code organization, and testing infrastructure
- Drive performance improvements across network efficiency, package size, and memory consumption
- Own testing strategy for mobile platform-specific challenges
- Mentor engineers on mobile architecture and best practices
- Uphold security and compliance standards required by government and enterprise clients
- Contribute to the open-source codebase

## What We're Looking For

We care about what you've built and the problems you've solved — not how long you've been building. If you have strong outcomes to speak to in mobile engineering, we want to hear from you.

Required

- Demonstrated experience with React Native and JavaScript/TypeScript — you can speak to real tradeoffs you've navigated
- Strong understanding of networking fundamentals: HTTP, WebSockets, connection lifecycle, and how to build resilient apps over unreliable networks
- Experience with offline-first design — local persistence, sync strategies, and conflict resolution
- Familiarity with native iOS and/or Android development
- AI fluency and a track record of adapting to new tooling as the landscape evolves

## Preferred

- Experience with reactive programming patterns (e.g. RxJS) or mobile database solutions (e.g. WatermelonDB)
- Familiarity with the Expo framework, including migration from bare React Native
- Mobile security best practices in enterprise or regulated environments
- Background in defense, intelligence, or critical infrastructure products
- Experience improving mobile developer tooling or testing infrastructure
- Open-source contributions
- Experience in distributed or remote-first engineering teams

## Compensation

Salary range: $165,000 – $225,000

Mattermost takes a market-based approach to pay. Compensation is determined based on skills, experience, qualifications, and work location. Ranges may be updated as market conditions evolve.

U.S. Eligibility & Compliance

This role may require obtaining and maintaining a U.S. government security clearance. Candidates must meet federal eligibility requirements to be considered. For more information visit[Security Clearances — United States Department of State](https://www.state.gov/securityclearances)

Applicants must meet eligibility requirements for access to export-controlled information as defined by U.S. export control laws, including EAR and ITAR. For more information visit the[Bureau of Industry and Security](https://www.bis.doc.gov) and the[Directorate of Defense Trade Controls](https://www.pmddtc.state.gov).

Mattermost is an EEO Employer, we are a remote-first, open-source company.

We are continually working to expand our hiring in more countries and regions, ensuring compliance with local laws and regulations, which takes time.

Mattermost values your unique perspective—we welcome all applicants. We encourage individuals from all backgrounds to apply and are committed to assessing candidates based on their skills and qualifications. We do not tolerate discrimination against staff or applicants based on race, religion, national origin, age, disability, pregnancy status, veteran status, or other personal characteristics.

If you require accommodations during the interview process, please let us know—we’re happy to assist.

## About Mattermost

## Company Overview
- **One-liner**: Mattermost provides a secure, open source collaboration platform for mission-critical work in complex environments, serving enterprise, defense, and government organizations.
- **Entity Type**: Private (open core, subscription-based)
- **Headquarters**: Palo Alto, California, USA (and online at [community.mattermost.com](https://community.mattermost.com))
- **Founded**: 2015 (open source project start)
- **Founders**: Not publicly available in provided sources

## Core Business
- **Primary industry/industries**: Secure collaboration, messaging, workflow automation, sovereign AI
- **Target customers**: B2B, Enterprise, Government, Defense, Critical Infrastructure (ICP: organizations with 2,500+ employees and in-house Dev/Sec/Ops talent)
- **Mission or purpose statement**: “To make the world safer and more productive by developing and delivering secure, open source collaboration software.” [handbook.mattermost.com](https://handbook.mattermost.com/company/about-mattermost)

## Products & Services
- **Mattermost Professional**: Open source (MIT license) messaging platform for teams of 10–50 developers and IT professionals. Self-hosted, with core integrations, archiving, search, and extensibility. [handbook.mattermost.com](https://handbook.mattermost.com/company/about-mattermost)
- **Mattermost Enterprise**: Commercial edition with advanced security, compliance, executive reporting, workflow automation, sovereign AI, and support for large-scale deployments. Includes features like classification banners, data spillage prevention, audit trails, attribute-based access controls, and playbook automation. [mattermost.com](https://mattermost.com/)
- **Key capabilities**: Real-time messaging, channels, audio/screenshare, workflow & playbook automation, Kanban boards, task management, integration platform (open API, webhooks, plugins), sovereign AI agents, Microsoft Teams interoperability. [mattermost.com](https://mattermost.com/)

## Market Standing
- **Valuation/Market Cap**: Not disclosed
- **Key Metric**: Annual Revenue not publicly available; Total Funding not publicly available (private company)
- **Notable Investors/Partners**: Not publicly available in provided sources; strong open source community and partner ecosystem (resellers, system integrators, deployment partners)
- **Growth Signals**: Remote-first company with 70% of R&D staff hired from open source community; used by thousands of organizations globally in 16 languages; trusted by governments, allied militaries, and critical infrastructure entities. [handbook.mattermost.com](https://handbook.mattermost.com/company/about-mattermost) | [mattermost.com](https://mattermost.com/)

## Competitive Advantages
- **Open source core**: Transparency, community-driven innovation, and ability to self-host.
- **Self-sovereign deployment**: Supports air-gapped, on-prem, and private cloud environments – critical for defense and intelligence.
- **Security & compliance**: Zero-trust architecture, classification banners, data spillage prevention, burn-on-read, full audit trails, and sovereign AI (no external dependencies).
- **Workflow automation**: Built-in playbooks, Kanban, and AI agents integrated directly into operational channels.
- **Interoperability**: Integration with Microsoft Teams and other mission-critical tools.

## Strategic Focus
- Accelerating mission-critical collaboration for national security, cybersecurity, and critical infrastructure teams.
- Expanding sovereign AI capabilities (LLM connectivity within customer perimeter) and human-machine teaming.
- Deepening workflow automation and playbook-driven incident response.
- Growing partner ecosystem and enterprise adoption in regulated industries.

## Why Work Here
- **Remote-first culture**: Majority of staff work from home; headquarters is on the internet (community.mattermost.com). Not remote-only – courtesy principle guides communication. [handbook.mattermost.com](https://handbook.mattermost.com/company/about-mattermost)
- **Mission impact**: Work deployed in mission-critical environments supporting defense, intelligence, and cyber organizations worldwide. [mattermost.com/careers](https://mattermost.com/careers/)
- **High-trust, fast-moving environment**: Ideas win on merit; employees wear multiple hats and have broad impact. [mattermost.com/careers](https://mattermost.com/careers/)
- **Leadership principles**: Earn trust, be a multi-tool player, high impact, customer obsession, ownership, self awareness.
- **Engineering culture**: ~70% of R&D staff come from open source community; contributors can transition to paid roles. [handbook.mattermost.com](https://handbook.mattermost.com/contributors/join-us)
- **Perks**: Not detailed in provided sources, but remote-first flexibility and open source community involvement are core benefits.

## Sources
1. [handbook.mattermost.com – About Mattermost](https://handbook.mattermost.com/company/about-mattermost)
2. [job-boards.greenhouse.io – Mattermost Jobs](http://job-boards.greenhouse.io/mattermost)
3. [mattermost.com/careers – Careers Page](https://mattermost.com/careers/)
4. [mattermost.com – Main Site](https://mattermost.com/)
5. [handbook.mattermost.com – Join Us](https://handbook.mattermost.com/contributors/join-us)

## Other roles at Mattermost

- [Staff Full Stack Engineer](https://feeny.ai/job/staff-full-stack-engineer-mattermost-united-states-kdmtj8jyype5) — United States
- [Staff Full Stack Engineer](https://feeny.ai/job/staff-full-stack-engineer-mattermost-toronto-550zy169chfz) — Toronto, Canada
- [Lead Site Reliability Engineer](https://feeny.ai/job/lead-site-reliability-engineer-mattermost-united-states-je123mpv22h1) — United States
- [Senior Full Stack Engineer](https://feeny.ai/job/senior-full-stack-engineer-mattermost-ontario-hhze2xzrs6mw) — Ontario, Canada / Toronto, Canada
- [Senior Full Stack Engineer](https://feeny.ai/job/senior-full-stack-engineer-mattermost-united-states-rrbt8txgdxxr) — United States
- [Technical Sales Engineer/ Lead](https://feeny.ai/job/technical-sales-engineer-lead-mattermost-tokyo-aw4kw32krh0z) — Tokyo, Japan
- [GRC Manager](https://feeny.ai/job/grc-manager-mattermost-united-states-w8va7dz6vn1c) — United States
- [Senior Account Executive (Enterprise)](https://feeny.ai/job/senior-account-executive-enterprise-mattermost-united-states-yhf7hz2n3bha) — United States
- [Senior Security Engineer](https://feeny.ai/job/senior-security-engineer-mattermost-spain-5k61149xhjte) — Spain
- [Senior Security Engineer](https://feeny.ai/job/senior-security-engineer-mattermost-germany-564jwxee0hm0) — Germany